Pump jack



Aug. 19, 1941.

W. c. EVERHART PUMP JACK Filed Oct. 1, 1940 2 Sheets-Sheet 1 gi Li gw. EVERHART PUMP JACK Filed Oct. 1, 1940 2 Sheets-Sheet 2 Illllllllllll Patented Aug. 19, 1941 UNITED stares parser orrlcs PUMP JACK William C. Ever-hart, Cherokee, Iowa Application October 1, 1940, Serial No. 359,285

(Cl. i i-45) 4 Claims.

This invention relates to a mechanism known in the trade as a pump jack which, in this instance, comprises driven means associated with other means for converting rotary into reciprocal motion so that a pump rod will be reciprocated to effect the pumping operation. An object of this invention is to produce a. complete unit containing the instrumentalities for effecting the foregoing result.

A further object of theinvention is to provide a casing having a motor stand, rigid thereon so that a motor mounted on the stand may be connected to a part effective to drive other parts for producing the result stated.

It is furthermore an object. of this invention to provide the casing with a standard or post on which a counterweight lever is osclllatable; means being provided for connecting the lever to a walking beam; andfurthermore, the invention includes a novel arrangement of the motor stand, whereby motors of different sizes may be adjustably anchored onthe said stand.

It is furthermorean object of the invention to.

provide adjustable means for connecting the walking beam to the pump rod and to provide a pump jack which will prove efficient and satisfactory in use and comparatively inexpensive to manufacture and maintain.

With the foregoing and other objects in view,

the invention consists in the details of construction, and in the arrangement and combination of parts to be hereinafter more fully set forth and claimed.

In describing the invention in detail, reference will be had to the accompanying drawings forming part of this application, wherein like characters denote corresponding. parts in the several views, and in which:

Figure 1 illustrates a View in side elevation of the pump jack and connections with the pump rod embodying the invention;

Figure 2 illustrates a front view in elevation of the mechanism;

Figure 3 illustrates a top plan view thereof;

Figure 4 illustrates an enlarged sectional View of the casing with the mechanism therein in elevation; V

Figure 5 illustrates a detail view of fragments of the upper and lower sections of the casing, showing the bearing of the shaft on which the rock arm is mounted;

Figure 6 illustrates a plan View of the internal mechanism, some parts being sectioned; and

Figure 7 illustrates a detail view of the motor stand.

In these drawings it denotes the upper section of the casing and H the lower section thereof, which are preferably connected together by suitable fastenings such as bolts l2 extendingthrough flanges i3 and M of the respective casing sec tions. The lower section H of the casing has a suitable supporting frame [5 which may be of any appropriate construction, but the outline of which in the present embodiment of the invention is readily visualized by an inspection of Figures 1 and 4. The contiguous or adjacent edges of the sections Ill and l l are provided with semicircular or otherwise formed seats such as It and 51, respectively, and a suitable gasket or packing It? may be interposed between the flanges of the sections to effect a liquid-proof joint. A motor stand 19 is stationed on the external surface of the casing, preferably at the top, and it is provided with a plurality of supporting bars or ribs 2e, each provided with a longitudinally disposed slot 2|, and the said supporting bars are adjusted in a longitudinally disposed slot 22 in each end of the stand and thus fastenings by which the motor is anchored to the stand may be adjusted.

The external surface of the casing is further provided with a lug or boss 23, recessed as at 24 for the reception and anchorage of the end of a standard 25 on which the lever 26 of the counterweight 21 is oscillatably mounted. The end of the lever remote from the weight is connected by links 28 with a walking beam 2e and this detail of construction is regarded as important as effecting an inexpensive connection or joint between the lever and the walking beam, as will presently appear. The walking beam 23 is mounted on a rock shaft 30 which has ends 3| partially rotatable in bearings 32, which bearings are lodged in the seats [6 and H of the casing sections. Suitable means may be provided for lubricating the bearings as those skilled in the art will understand. Other seats in the housing contain bearings such as 33 and 34, and one set of such bearings is provided for the shaft 35 on which sprocket wheels 36 are mounted, whereas another set of such bearings is associated with a shaft 31, to which sprocket Wheels 38 are keyed. Sprocket chains 39 operate over the aforesaid sprocket wheels 36 and 38 and as the shaft 3? is a power or driven shaft, the chains 39 communicate motion from the sprocket wheels 38 to the sprocket wheels 36.

An apertured boss M! is fixed externally of the lower section of the casing and an adjusting rod 4| extends therethrough. The outer end of the rod is threaded and it is engaged by a nut 12 by which the rod is longitudinally adjusted. The

and the said arm has one end oscillatably connected to an anchor attached to the interior of the lower sectiOn of the casing. An idle wheel 45 is rotatably mounted in the free end of the arm for engagement with the chains 39 in order that the tension of the chains may be regulated through the adjustment of the nut 42. The details of construction of this tightening instrumentality need not, it is thought, be further shown or described, since in this regard it may be in the nature of a belt tightener well known to those skilled in the art,

The sprocket wheels 35 are spaced, one from the other, and the walking beam projects therebetween. A shaft 47 has its ends anchored in the wheels 36 and it extends through the space between the said wheels. A roller or anti-friction member 48 is rotatable on the said shaft and it is located in an elongated slot 19 in an enlarged portion 50 of the walking beam so that, as the wheel 36 rotates, it carries the slotted end of the walking beam upwardly and downwardly practically to the extent in which the upper stroke of the walking beam is shown by dotted lines in Fig. 4. The end of the walking beam remote from the casing is preferably provided with furcations 5i, which furcations have enlarged outer ends 52, each provided with a slot 53, in which a sleeve 54 is seated, and the said sleeve has a pin 55 therethrough. An arm 55 is connected to each sleeve so that the said arm is oscillatably connected to the enlarged portion 52. A link 51, in the nature of a channel iron, is connected to each of the arms55, and adjustment of the links with relation to the arms may be accomplished through the use of a plurality of apertures, such as 58. The upper end of each link is connected to a crossbar 59 anchored to the links 51 by a suitable means, such as bolts 55 or the like, and the said crossbar has parallel lugs or cars 6! suitably spaced to receive the pump rod 62, and the said pump rod is connected to the lugs or cars by a fastening 63, such as a bolt. 7

As shown in the drawings, the links 28 at their lower ends terminate in hooks 23a which em-- brace the lower edges of the furcations 5| and since the counterweight 2'! is of such specific gravity as to act as a counterweight to the pump rod, it is sufficiently heavy to retain the links in engagement with the arms or furcations of the walking beam and hence no further mechanical retaining means for the joint between the links and the walking beam need be provided.

The shaft 31 extends externally of the casing and it is provided with a pulley 64 which is connected to a pulley $5 of the motor 66 by a belt 51.

The casing may contain a lubricant, such as oil, in which a part of the chain will be submerged and the chain will thus carry suff cient lubricant to prevent undue wear of the chain and sprocket therewith.

I claim:

km a pump jack, a casing, a motor stand thereon, a motor on said stand, a shaft journaled in the casing driven by said motor, spaced sprocket wheels on the shaft, a second shaft journaled in the casing, spaced sprocket wheels on the second mentioned shaft, sprocket chains engaging the sprocket wheels on the first and second mentioned shafts, a shaft extending through the spaces between the second mentioned sprocket wheels and anchored to said sprocket wheels, a walking beam having a slotted inner end through which the said shaft projects whereby the rotary motion of the wheels oscillates the said walking beam, a standard anchored externally of the casing and extending thereabove, a weighted lever oscillatably mounted on said standard, links pivoted to the outer end of said lever, a counterweight on the lever on the side of the pivot thereof remote from the links, the said walking beam having a bifurcated end, hooks on the lower ends of the links embracing the furcations of the walking beam, each furcation of the walking beam having an opening, a sleeve oscillatably mounted in each opening, an arm on each sleeve extending upwardly from the walking beam, a channel iron attached to each of the arms and extending upwardly, a cross arm attached to the said channel irons having spaced apertured lugs, a pump rod located in the space between the said lugs, and means for pivoting the walking beam thereto.

2. In a pump jack, a casing, a motor stand thereon, a motor on said stand, a shaft journaled in the casing driven by said motor, spaced sprocket wheels on the shaft, a second shaft journaled in the casing, spaced sprocket wheels on the second mentioned shaft, sprocket chains engaging the sprocket wheels on the first and second mentioned shafts, an arm pivoted within the casing, an anti-friction roller thereon engaging the sprocket chains, means extending from the arm to a position externall of the casing for adjusting the position of said arm and regulating the tension of the sprocket chains, a shaft extending through the spaces between the second mentioned sprocket wheels and anchored to said sprocket wheels, a walking beam having a slotted inner end through which the said shaft projects whereby the rotary motion of the wheels oscillates the said walking beam, a standard anchored externally of the casing and extending,

thereabove, a weighted lever oscillatably mounted on said standard, links pivoted to the outer end of said lever, a counterweight on the lever on the side of the pivot thereof remote from the links, the said walking beam having a bifurcated end, hooks on the lower ends of the links embracing the furcations of the walking beam, each furcation of the walking beam having an opening, a sleeve oscillatably mounted in each opening, an arm on each sleeve extending upwardly from the walking beam, a channel iron attached to each of the arms and extending upwardly, a cross arm attached to the said channel irons having spaced apertured lugs, a pump rod located in the space between the said lugs, and means for pivoting the walking beam thereto.

3. In a pump jack, a casing, a motor stand thereon, a motor on said stand, a shaft journaled in the casing driven by said motor, spaced sprocket wheels on the shaft, a second shaft journaled' in the casing, spaced sprocket wheels on the second mentioned shaft, sprocket chains engaging the sprocket wheels on the first and second mentioned shafts, an arm pivoted within the casing, an anti-friction roller thereon engaging the sprocket chains, a rod pivotally connected to the arm and extending through the casing, means on the outer end of the rod for adjusting the position of the arm for regulating the tension of the sprocket chains, a shaft extending through the spaces between the second mentioned sprocket wheels and anchored to said sprocket wheels, a walking beam having a slotted inner end through which the said shaft projects whereby the rotary motion of the wheels oscillates the said walking beam, a standard anchored externally of the casing and extending thereabove, a weighted lever oscillatably mounted on said standard, links pivoted to the outer end of said lever, a counterweight on the lever on the side of the pivot thereof remote from the links, the said walking beam having a bifurcated end, hooks on the lower ends of the links embracing the furcations of the walking beam, each furcation of the walking beam having an opening, a sleeve oscillatably mounted in each opening, an arm on each sleeve extending upwardly from the walking beam, a channel iron attached to each of the arms and extending upwardly, a cross arm attached to the said'channel irons having Spaced apertured lugs, a pump rod located in the space between the said lugs, and means for pivoting the walking beam thereto.

4. In a pump jack, a casing, a motor stand thereon, a motor on said stand, a shaft journaled in the casing driven by said motor, a sprocket wheel on the shaft, a second shaft journaled in the casing, a sprocket wheel onthe second mentioned shaft, a sprocket chain engaging the said sprocket wheels on the first and second mentioned shafts, a shaft-like member projecting from the second mentioned sprocket wheel and carried thereby, a walking beam having a slotted end through which said shaft-like member projects whereby the rotary motion of the wheel oscillates the said walking beam, a standard anchored externally of the casing and extending thereabove, a weighted lever oscillatably mounted on said standard, links pivoted to the outer end of said lever and connected to the walking beam, a counterweight on the lever on the side of the pivot thereof remote from the link, arms extending upwardly from the outer end of the walking beam, a pump rod, means for connecting the arms to the pump rod whereby movement of the walking beam is communicated to said pump rod.

WILLIAM C. EVERHART. 

